Better support for "subprojects" within a project

[seancorfield]

Make it easier to support "non-traditional" project structures, such as a monorepo where the top-level perhaps contains build-related stuff and the actual "project" is in one or more subfolders.

Ah ok. For example, I structure my projects where the top-level directory is "what runs on my laptop," e.g. what's required to create and run the container and then "what runs inside the container" is in a sub-directory, like https://gitlab.com/tvaughan/kibit-runner. For larger projects involving multiple containers, as well as limiting the host mounted volume to each project's sub-directory instead of the top-level directory (see the top-level Makefile) this layout has been really helpful (edited)

The :target-dir option helps with this since you can specify a nested folder to be created as the target directory and, once #1 is implemented, you would be able to overlay multiple templates into a single monorepo-style structure. This can be explained in the documentation.

[seancorfield]

I think this will be covered by the documentation created for #2 so I'm closing this out.